Unable to extract preloads (substack site)

[ballo]

DO NOT REMOVE OR SKIP THE ISSUE TEMPLATE

• I understand that I will be blocked if I intentionally remove or skip any mandatory* field

Checklist

• I'm reporting a new site support request
• I've verified that I'm running yt-dlp version 2023.03.04 (update instructions) or later (specify commit)
• I've checked that all provided URLs are playable in a browser with the same IP and same login details
• I've checked that none of provided URLs violate any copyrights or contain any DRM to the best of my knowledge
• I've searched known issues and the bugtracker for similar issues including closed ones. DO NOT post duplicates
• I've read the guidelines for opening an issue
• I've read about sharing account credentials and am willing to share it if required

Region

USA

Example URLs

https://kisses.substack.com/p/part-1-goodbye-to-mum-goodbye-to#details

Provide a description that is worded well enough to be understood

The executable said to report this as a bug, but it didn't say what category I should file it in. Seems to be a more general embed bug?

Provide verbose output that clearly demonstrates the problem

• Run your yt-dlp command with -vU flag added (yt-dlp -vU <your command line>)
• If using API, add 'verbose': True to YoutubeDL params instead
• Copy the WHOLE output (starting with [debug] Command-line config) and insert it below

Complete Verbose Output

~ $ yt-dlp -vU -F https://kisses.substack.com/p/part-1-goodbye-to-mum-goodbye-to#details
[debug] Command-line config: ['-vU', '-F', 'https://kisses.substack.com/p/part-1-goodbye-to-mum-goodbye-to#details']
[debug] Encodings: locale utf-8, fs utf-8, pref utf-8, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version stable@2023.03.04 [392389b7d] (pip)
[debug] Python 3.11.2 (CPython aarch64 64bit) - Linux-4.4.153-17214672-aarch64-with-libc (OpenSSL 3.0.8 7 Feb 2023, libc)
[debug] exe versions: ffmpeg 6.0 (setts), ffprobe 6.0
[debug] Optional libraries: Cryptodome-3.17, brotli-1.0.9, certifi-2022.12.07, mutagen-1.46.0, sqlite3-2.6.0, websockets-10.4
[debug] Proxy map: {}
[debug] Loaded 1786 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp/releases/latest
Available version: stable@2023.03.04, Current version: stable@2023.03.04
yt-dlp is up to date (stable@2023.03.04)
[Substack] Extracting URL: https://kisses.substack.com/p/part-1-goodbye-to-mum-goodbye-to#details
[Substack] part-1-goodbye-to-mum-goodbye-to: Downloading webpage
ERROR: [Substack] part-1-goodbye-to-mum-goodbye-to: Unable to extract preloads; please report this issue on  https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template. Confirm you are on the latest version using  yt-dlp -U
  File "/data/data/com.termux/files/usr/lib/python3.11/site-packages/yt_dlp/extractor/common.py", line 694, in extract
    ie_result = self._real_extract(url)
                ^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/usr/lib/python3.11/site-packages/yt_dlp/extractor/substack.py", line 80, in _real_extract
    webpage_info = self._search_json(r'<script[^>]*>\s*window\._preloads\s*=', webpage, 'preloads', display_id)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/usr/lib/python3.11/site-packages/yt_dlp/extractor/common.py", line 1256, in _search_json
    json_string = self._search_regex(
                  ^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/usr/lib/python3.11/site-packages/yt_dlp/extractor/common.py", line 1242, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)

~

[bashonly]

Duplicate of #7155